<?php  //$Id: calculation_form.php,v 1.7.2.1 2007/11/23 22:12:35 skodak Exp $

///////////////////////////////////////////////////////////////////////////
//																	   //
// NOTICE OF COPYRIGHT												   //
//																	   //
// Moodle - Modular Object-Oriented Dynamic Learning Environment		 //
//		  http://moodle.com											//
//																	   //
// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com	   //
//																	   //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or	 //
// (at your option) any later version.								   //
//																	   //
// This program is distributed in the hope that it will be useful,	   //
// but WITHOUT ANY WARRANTY; without even the implied warranty of		//
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the		 //
// GNU General Public License for more details:						  //
//																	   //
//		  http://www.gnu.org/copyleft/gpl.html						 //
//																	   //
///////////////////////////////////////////////////////////////////////////

require_once $CFG->libdir.'/formslib.php';

class edit_calculation_form extends moodleform {
	var $available;
	var $noidnumbers;

	function definition() {
		global $COURSE;

		$mform =& $this->_form;

		$itemid = $this->_customdata['itemid'];

		$this->available = grade_item::fetch_all(array('courseid'=>$COURSE->id));
		$this->noidnumbers = array();

		// All items that have no idnumbers are added to a separate section of the form (hidden by default),
		// enabling the user to assign idnumbers to these grade_items.
		foreach ($this->available as $item) {
			if (empty($item->idnumber)) {
				$this->noidnumbers[$item->id] = $item;
				unset($this->available[$item->id]);
			}
			if ($item->id == $itemid) { // Do not include the current grade_item in the available section
				unset($this->available[$item->id]);
			}
		}

/// visible elements
		$mform->addElement('header', 'general', get_string('gradeitem', 'grades'));
		$mform->addElement('static', 'itemname', get_string('itemname', 'grades'));
		$mform->addElement('textarea', 'calculation', get_string('calculation', 'grades'), 'cols="60" rows="5"');
		$mform->setHelpButton('calculation', array('calculation', get_string('calculation', 'grades'), 'grade'));

/// hidden params
		$mform->addElement('hidden', 'id', 0);
		$mform->setType('id', PARAM_INT);

		$mform->addElement('hidden', 'courseid', 0);
		$mform->setType('courseid', PARAM_INT);

		$mform->addElement('hidden', 'section', 0);
		$mform->setType('section', PARAM_ALPHA);
		$mform->setDefault('section', 'calculation');

/// add return tracking info
		$gpr = $this->_customdata['gpr'];
		$gpr->add_mform_elements($mform);

		$this->add_action_buttons();
	}

	function definition_after_data() {
		global $CFG, $COURSE;

		$mform =& $this->_form;
	}

/// perform extra validation before submission
	function validation($data, $files) {
		$errors = parent::validation($data, $files);

		$mform =& $this->_form;

		// check the calculation formula
		if ($data['calculation'] != '') {
			$grade_item = grade_item::fetch(array('id'=>$data['id'], 'courseid'=>$data['courseid']));
			$calculation = calc_formula::unlocalize(stripslashes($data['calculation']));
			$result = $grade_item->validate_formula($calculation);
			if ($result !== true) {
				$errors['calculation'] = $result;
			}
		}

		return $errors;
	}

}
?>
